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房颤的血栓栓塞并发症及其预防

国外医学（心血管疾病分册） 1991年第1期18卷 18-20页

作者： petersen P 戈戎

作者对房颤患者血栓栓塞并发症的危险因素进行了评述,主要讨论甲状腺毒性房颤、阵发性房颤(及由此转变成慢性房颤)、左房扩大、隐性脑血管栓塞和脑血流降低所起的作用。作者认为,非风湿性慢性房颤患者应予抗凝治疗。

关键词：房颤血栓栓塞并发症预防

Feedback Interconnection of Open Quantum Systems:A Small Gain Theorem

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Feedback Interconnection of Open Quantum Systems:A Small Gai...

Immunological and functional features of decellularized xenogeneic heart valves after transplantation into GGTA1-KO pigs

Joint 48th IEEE Conference on Decision and Control and 28th Chinese Control Conference

作者： Ram Somaraju Ian petersen School of Information Technology and Electrical Engineering University of New South Wales at the Australian Defence Force Academy

This paper examines the stability of quantum feedback *** introduce a novel characterization,in terms of equivalence classes of operators,that may be used to describe open quantum *** this characterization,equivalence classes of operators are shown to be elements of a Banach space such that the norm of an operator is analogous to the root mean square expectation value of the *** characterization is ideally suited to describing quantum feedback systems and enables us to prove the uniqueness and existence of solutions for feedback *** this context,we prove a quantum version of the small-gain theorem that is a generalisation of the classical small gain theorem.

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Regenerative Biomaterials 2021年第5期8卷 25-36页

作者： Robert Ramm Tobias Goecke Peter Kohler Igor Tudorache Serghei Cebotari Anatol Ciubotaru Samir Sarikouch Klaus Hoffler Friederike Bothe Bjorn petersen Axel Haverich Heiner Niemann Andres Hilfiker Leibniz Research Laboratories for Biotechnology and Artificial Organs(LEBAO) Hannover Medical SchoolCarl-Neuberg Str.1Hannover 30625Germany Department of Cardiac- Thoracic-Transplantation and Vascular SurgeryHannover Medical SchoolCarl-Neuberg Str.1Hannover 30625Germany Institute of Farm Animal Genetics Friedrich-Loeffler-InstitutHoeltystr.1031535 Mariensee/Neustadt am RuebenbergeGermany Medimplant GmbH Bischofsholer Damm 15Hannover 30173Germany

Decellularization of xenogeneic heart valves might lead to excellent regenerative implants,from which many patients could ***,this material carries various xenogeneic epitopes and thus bears a considerable inherent immunological ***,we investigated the regenerative and immunogenic potential of xenogeneic decellularized heart valve implants using pigs deficient for the galactosyltransferase gene(GGTA1-KO)as novel large animal *** aortic and pulmonary heart valves obtained from sheep,wild-type pigs or GGTA1-KO pigs were implanted into GGTA1-KO pigs for 3,or 6 months,*** were analyzed histologically,immunhistologically(CD3,CD21 and CD172a)and anti-aGal antibody serum titers were determined by *** sheep derived implants exhibited a strong immune reaction upon implantation into GGTA1-KO pigs,characterized by massive inflammatory cells infiltrates,presence of foreign body giant cells,a dramatic increase of anti-aGal antibody titers and ultimately destruction of the graft,whereas wild-type porcine grafts induced only a mild reaction in GGTA1-KO *** implants,wild-type/wild-type and GGTA1-KO/GGTA1-KO valves did not induce a measurable immune ***,GGTA1-KO pigs developed a‘human-like’immune response toward decellularized xenogeneic implants showing that immunogenicity of xenogeneic implants is not sufficiently reduced by decellularization,which detracts from their regenerative potential.

关键词： aGal-KO pig decellularization heart valves xenoantibodies large animal model

Biomineralization,crystallography and magnetic properties of bullet-shaped magnetite magnetosomes in giant rod magnetotactic bacteria

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Biomineralization,crystallography and magnetic properties of...

景观规划导向的绿色基础设施研究进展——基于“格局—过程—服务—可持续性”研究范式

中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： Nicolas Menguy Nikolai petersen France-China Bio-Mineralization and Nano-Structures Laboratory Beijing 100029China Department of Earth and Environmental Science Ludwig-Maximilians-UniversitatD-80333 MunichGermany

Magnetosomes produced by magnetotactic bacteria are of great interest for understanding bacterial biomineralization along with sedimentary magnetism and environmental *** of the most intriguing species,Magnetobacterium bavaricum can synthesize hundreds of bullet-shaped magnetite magnetosomes per cell,which contribute significantly to magnetic properties of ***,the biomineralization mechanism and magnetic properties of such magnetosomes remain *** this paper,we have conducted a comprehensive study of the crystallography and magnetic properties of bullet-shaped magnetosomes formed by uncultivated giant rod magnetotactic bacteria(referred to as MYR-1), recently discovered in Lake Miyun(Beijing,China).Transmission electron microscopy observations reveal that each MYR-1 cell contains hundreds of bullet-shaped magnetite magnetosomes,which are arranged into 3-5 braid-like bundles of *** formation of the bullet-shaped magnetosomes can be divided into two stages:initial isotropic growth(up to～20 nm)followed by elongation along the[100]direction,which is unusual compared with the expected[111]magnetic easy *** the[100]orientation is the hard axis of the face-centered cubic magnetite,the shape anisotropy of bullet-shaped magnetosomes and intra-bundle magnetostatic interactions confine the magnetization direction of the chain along the long axis of the cell/*** to each bundle of magnetosome chains effectively behaving as an elongated single domain particle,the MYR-1 cells show high coercivity,weak intra-bundle magnetostatic interaction,and high 6-ratio. These results provide new insights into the biomineralization process and magnetic properties of bullet-shaped magnetite magnetosomes.

关键词： magnetotactic bacteria bullet-shaped magnetite magnetosome biomineralization crystallography sedimentary magnetism

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自然资源学报 2021年第2期36卷 435-448页

作者：李凯侯鹰 Hans Skov-petersen Peter S.Andersen 哥本哈根大学地理科学与自然资源管理系哥本哈根1165 中国科学院生态环境研究中心城市与区域生态国家重点实验室北京100085

中国目前处于新型城镇化与生态文明建设的重要时期,引入绿色基础设施(Green Infrastructure,GI)规划框架对协调城市发展与生态保护具有重要意义。基于景观生态学中"格局—过程—服务—可持续性"研究范式,对近年来中国内外GI规划进行针... 详细信息

中国目前处于新型城镇化与生态文明建设的重要时期,引入绿色基础设施(Green Infrastructure,GI)规划框架对协调城市发展与生态保护具有重要意义。基于景观生态学中"格局—过程—服务—可持续性"研究范式,对近年来中国内外GI规划进行针对性综述,利用该范式对相关研究的理论来源与进展进行梳理。研究表明:GI格局研究中,景观格局指数是应用最为广泛的方法。针对于景观连接度,形态学空间格局分析等结构连接度评价方法具有计算简单、适用性广的优势,但缺乏明确的生态学含义;图论等功能连接度则针对特定的生态过程,是GI格局与生态过程的重要联系,将是下一步研究重点。GI生态过程研究借鉴生态网络的理论与方法,其规划步骤可分为核心区选取、阻力面构建、潜在廊道识别三部分。GI生态系统服务研究中,生物物理量模型与经济计量模型广泛应用于调节、供给与支持服务评价中,而文化服务评价则将问卷调查作为基础数据获取的重要途径。另外,生态系统服务需求研究涉及到生态系统服务的实际需求与使用偏好,相关定量评价方法以及成果的实际应用有待进一步探索。GI景观可持续性研究中,在明晰GI提供的生态系统服务总量的基础上,服务间权衡与协同效应已成为GI规划中的重要考量,而情景规划可以有效模拟GI生态系统服务的动态变化。最后,GI规划应将提升景观可持续性作为规划目标,据此研究提出了重视格局与过程相互影响机制的基础研究、加深GI生态系统服务需求端研究、明晰生态系统服务间协同与权衡效应、将GI与实际规划结合四项研究展望。

关键词：风景园林景观生态学格局—过程—服务—可持续性绿色基础设施

Complete recovery after the removal of an ectopic testicle in a case of primary reninism and retroperitoneal hemangioma

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Asian Journal of Andrology 2006年第2期8卷 247-250页

作者： Bemhard Glodny Alexandar Tzankov Germar-Michael Pinggera Johannes petersen Ralf Herwig Department of Radiology Medical University of Innsbruck Innsbruck 6020Austria Institute of Patholog Medical University of InnsbruckInnsbruck 6020Austria Department of Urology Medical University of InnsbruckInnsbruck 6020Austria Department of Radiology Medical University of InnsbruckInnsbruck 6020Austria

A 32-year-old man recovered completely from hypokalemic hypertension that had been caused by primary reninism after the ablation of an ectopic left testis, epididymis and ductus deferens. For several years, severe hypertension has been resistant to treatment, even the concurrent administration of up to seven antihypertensive agents. In this case, cryptorchidism was associated with an indirect inguinal hernia and an open peritoneo-vaginal process on both sides, aplasia of the posterior wall of the inguinal canal on the right side, an umbilical hernia, and a retroperitoneal tendrillar hemangioma. （Asian J Androl 2006 Mar; 8： 247-250）

关键词： primary reninism cryptorchidism peritoneo-vaginal process Sertoli-cell-only syndrome hypertension secondary aldosteronism hemangioma

Analysis of a Simple Probe for <i>In-Situ</i>Resistivity Measurements

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Journal of Water Resource and Protection 2017年第1期9卷 1-10页

作者： Jens Munk Todd petersen Matt Cullin William Schnabel Department of Electrical Engineering University of Alaska Anchorage Anchorage AK USA Department of Mechanical Engineering University of Alaska Anchorage Anchorage AK USA University of Alaska Fairbanks Fairbanks AK USA

We present a probe factor for a simple measurement device, which can be used to determine in-situ electrical resistivity in soils or other penetrable bodies. The probe is primarily sensitive to the material immediately surrounding it and therefore is ideal for determining localized conductivities. The geometry of the probe can be scaled to effectively adjust the region of interest. The calibration, or “probe factor” is a function of the geometry, as well as the electrode configuration. Results are presented assuming a Wenner array configuration, however they can easily be extended to other geometries, such as the Schlumberger or dipole-dipole array.

关键词： Electrical Resistivity Measurements Soil Moisture Electrical Conductivity Geophysical Measurement

Effects of Reduced <i>in Utero</i>and Post-Weaning Nutrition on Glucose Clearance Measures and Serum Metabolites

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Agricultural Sciences 2018年第8期9卷 947-957页

作者： Richard Waterman Mark petersen Thomas Geary Lance Vermeire USDA-ARS Fort Keogh Livestock and Range Research Laboratory Miles City MT USA

Lowering production costs while maintaining an optimal level of production is important to producers in extensive environments. Efforts that strive to match the environment to the nutritional requirements of the grazing animal will substantially improve economic returns to the producer. Therefore, a 3-yr study was implemented that evaluated glucose clearance and serum metabolites in primiparous beef heifers (n = 48;16/yr) from two different feeding regimes. Serum metabolites and glucose clearance measures were analyzed by fitting a repeated measure mixed model using the MIXED procedure of SAS 9.4 (SAS Inst., Inc., Cary, NC). Heifers dams received adequate 1.8 (ADEQ) or marginal 1.2 (MARG) kg/d winter supplementation for approximately 80 d prior to parturition and their heifer calves were then randomly assigned to heifer development treatments that provided ad-libitum (AL) or 80% of ad-libitum (LAL) feed post weaning. Heifers that received the AL treatment during the developmental period were then assigned the 1.8 kg/d winter supplementation for life, whereas heifers that received the LAL treatment during development were assigned the 1.2 kg/d winter supplementation for life. Peak glucose concentrations in response to a bolus dose of glucose changed in magnitude between ADEQ and MARG in utero treatments and decreased further removed from parturition (P = 0.05). However, these changes did not manifest along with other glucose clearance measures (P > 0.17) indicating that regardless of in utero treatment or heifer development treatment the reduction in feed input did not greatly influence glucose clearance measures or baseline serum metabolites throughout postpartum, first parity period.

关键词： Heifer Development Glucose Primiparous Beef Cow

Climate Change Impacts on Water Resources in Yemen

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Journal of Earth Science and Engineering 2013年第9期3卷 629-638页

作者： Abdulla Noaman Georg petersen Jens Kiesel Steven Wade Faculty of Engineering Sana 'a University Sana 'a 2054 Yemen HYDROC Consult Langballig 24977 Germany HR Wallingford Ltd. Wallingford OX108BA UK

Climate change impacts on water resources are expected to be significant in Yemen. Efforts have been made to understand the expected changes and develop mitigation possibilities for the expected scenarios for a future sustainable use of resources and mitigation of expected impacts. The paper describes the development of a detailed baseline database and the assessment of climate change and variability impacts on water resources over the 2030, 2050 and 2080 time horizon on a Yemen-wide scale. Based on downscaled Global Climate Model data, a range of scenarios were established, representing potential Mean, Warm ＆ Wet and Hot ＆ Dry conditions as derived by evaluating worst case scenarios from the ensemble of the global models for the specified years. The results of the model include an estimated runoff coefficient, monthly rainfall, runoff, infiltration and evaporation representing the water balance in the different catchments. Analysis of the different evaluated scenarios shows that in the Mid, Warm and Wet scenario the hydrological components are generally higher than in the baseline scenario. For the Hot ＆ Dry scenario, runoff, infiltration and evapotranspiration are decreasing due to the decreasing precipitation and increase in temperature. The relative changes in runoff are strongest.

关键词： Climate change water resources groundwater spate flow arid wadi hydrology